diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/dl-osinfo.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/dl-osinfo.h | 226 |
1 files changed, 63 insertions, 163 deletions
diff --git a/sysdeps/unix/sysv/linux/dl-osinfo.h b/sysdeps/unix/sysv/linux/dl-osinfo.h index 3c93218dfc..abc67fcdcf 100644 --- a/sysdeps/unix/sysv/linux/dl-osinfo.h +++ b/sysdeps/unix/sysv/linux/dl-osinfo.h @@ -1,5 +1,5 @@ -/* Operating system specific code for generic dynamic loader functions. Linux. - Copyright (C) 2000,2001,2002,2004,2005,2006 Free Software Foundation, Inc. +/* Operating system specific code for generic dynamic loader functions. + Copyright (C) 2000, 2001, 2002, 2004 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -18,14 +18,10 @@ 02111-1307 USA. */ #include <string.h> -#include <errno.h> #include <fcntl.h> +#include <sys/sysctl.h> #include <sys/utsname.h> -#include <kernel-features.h> -#include <dl-sysdep.h> -#include <stdint.h> -#include <hp-timing.h> -#include <endian.h> +#include "kernel-features.h" #ifndef MIN # define MIN(a,b) (((a)<(b))?(a):(b)) @@ -43,167 +39,71 @@ dl_fatal (const char *str) } #endif -static inline int __attribute__ ((always_inline)) -_dl_discover_osversion (void) -{ -#if (defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO) && defined SHARED - if (GLRO(dl_sysinfo_map) != NULL) - { - /* If the kernel-supplied DSO contains a note indicating the kernel's - version, we don't need to call uname or parse any strings. */ - - static const struct - { - ElfW(Word) vendorlen; - ElfW(Word) datalen; - ElfW(Word) type; - char vendor[8]; - } expected_note = { sizeof "Linux", sizeof (ElfW(Word)), 0, "Linux" }; - const ElfW(Phdr) *const phdr = GLRO(dl_sysinfo_map)->l_phdr; - const ElfW(Word) phnum = GLRO(dl_sysinfo_map)->l_phnum; - for (uint_fast16_t i = 0; i < phnum; ++i) - if (phdr[i].p_type == PT_NOTE) - { - const ElfW(Addr) start = (phdr[i].p_vaddr - + GLRO(dl_sysinfo_map)->l_addr); - const struct - { - ElfW(Word) vendorlen; - ElfW(Word) datalen; - ElfW(Word) type; - } *note = (const void *) start; - while ((ElfW(Addr)) (note + 1) - start < phdr[i].p_memsz) - { - if (!memcmp (note, &expected_note, sizeof expected_note)) - return *(const ElfW(Word) *) ((const void *) note - + sizeof expected_note); -#define ROUND(len) (((len) + sizeof (ElfW(Word)) - 1) & -sizeof (ElfW(Word))) - note = ((const void *) (note + 1) - + ROUND (note->vendorlen) + ROUND (note->datalen)); - } - } - } -#endif - - char bufmem[64]; - char *buf = bufmem; - unsigned int version; - int parts; - char *cp; - struct utsname uts; - - /* Try the uname system call. */ - if (__uname (&uts)) - { - /* This was not successful. Now try reading the /proc filesystem. */ - int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY); - if (fd < 0) - return -1; - ssize_t reslen = __read (fd, bufmem, sizeof (bufmem)); - __close (fd); - if (reslen <= 0) - /* This also didn't work. We give up since we cannot - make sure the library can actually work. */ - return -1; - buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0'; - } - else - buf = uts.release; - - /* Now convert it into a number. The string consists of at most - three parts. */ - version = 0; - parts = 0; - cp = buf; - while ((*cp >= '0') && (*cp <= '9')) - { - unsigned int here = *cp++ - '0'; - - while ((*cp >= '0') && (*cp <= '9')) - { - here *= 10; - here += *cp++ - '0'; - } - ++parts; - version <<= 8; - version |= here; - - if (*cp++ != '.') - /* Another part following? */ - break; - } - - if (parts < 3) - version <<= 8 * (3 - parts); - - return version; -} - -#define DL_SYSDEP_OSCHECK(FATAL) \ +#define DL_SYSDEP_OSCHECK(FATAL) \ do { \ - /* Test whether the kernel is new enough. This test is only performed \ - if the library is not compiled to run on all kernels. */ \ - \ - int version = _dl_discover_osversion (); \ - if (__builtin_expect (version >= 0, 1)) \ + /* Test whether the kernel is new enough. This test is only \ + performed if the library is not compiled to run on all \ + kernels. */ \ + if (__LINUX_KERNEL_VERSION > 0) \ { \ - if (__builtin_expect (GLRO(dl_osversion) == 0, 1) \ - || GLRO(dl_osversion) > version) \ - GLRO(dl_osversion) = version; \ + char bufmem[64]; \ + char *buf = bufmem; \ + unsigned int version; \ + int parts; \ + char *cp; \ + struct utsname uts; \ + \ + /* Try the uname syscall */ \ + if (__uname (&uts)) \ + { \ + /* This was not successful. Now try reading the /proc \ + filesystem. */ \ + ssize_t reslen; \ + int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY); \ + if (fd == -1 \ + || (reslen = __read (fd, bufmem, sizeof (bufmem))) <= 0) \ + /* This also didn't work. We give up since we cannot \ + make sure the library can actually work. */ \ + FATAL ("FATAL: cannot determine kernel version\n"); \ + __close (fd); \ + buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0'; \ + } \ + else \ + buf = uts.release; \ + \ + /* Now convert it into a number. The string consists of at most \ + three parts. */ \ + version = 0; \ + parts = 0; \ + cp = buf; \ + while ((*cp >= '0') && (*cp <= '9')) \ + { \ + unsigned int here = *cp++ - '0'; \ + \ + while ((*cp >= '0') && (*cp <= '9')) \ + { \ + here *= 10; \ + here += *cp++ - '0'; \ + } \ + \ + ++parts; \ + version <<= 8; \ + version |= here; \ + \ + if (*cp++ != '.') \ + /* Another part following? */ \ + break; \ + } \ + \ + if (parts < 3) \ + version <<= 8 * (3 - parts); \ \ /* Now we can test with the required version. */ \ - if (__LINUX_KERNEL_VERSION > 0 && version < __LINUX_KERNEL_VERSION) \ + if (version < __LINUX_KERNEL_VERSION) \ /* Not sufficent. */ \ FATAL ("FATAL: kernel too old\n"); \ + \ + GLRO(dl_osversion) = version; \ } \ - else if (__LINUX_KERNEL_VERSION > 0) \ - FATAL ("FATAL: cannot determine kernel version\n"); \ } while (0) - -static inline uintptr_t __attribute__ ((always_inline)) -_dl_setup_stack_chk_guard (void) -{ - uintptr_t ret; -#ifdef ENABLE_STACKGUARD_RANDOMIZE - int fd = __open ("/dev/urandom", O_RDONLY); - if (fd >= 0) - { - ssize_t reslen = __read (fd, &ret, sizeof (ret)); - __close (fd); - if (reslen == (ssize_t) sizeof (ret)) - return ret; - } -#endif - ret = 0; - unsigned char *p = (unsigned char *) &ret; - p[sizeof (ret) - 1] = 255; - p[sizeof (ret) - 2] = '\n'; -#ifdef HP_TIMING_NOW - hp_timing_t hpt; - HP_TIMING_NOW (hpt); - hpt = (hpt & 0xffff) << 8; - ret ^= hpt; -#endif - uintptr_t stk; - /* Avoid GCC being too smart. */ - asm ("" : "=r" (stk) : "r" (p)); - stk &= 0x7ffff0; -#if __BYTE_ORDER == __LITTLE_ENDIAN - stk <<= (__WORDSIZE - 23); -#elif __WORDSIZE == 64 - stk <<= 31; -#endif - ret ^= stk; - /* Avoid GCC being too smart. */ - p = (unsigned char *) &errno; - asm ("" : "=r" (stk) : "r" (p)); - stk &= 0x7fff00; -#if __BYTE_ORDER == __LITTLE_ENDIAN - stk <<= (__WORDSIZE - 29); -#else - stk >>= 8; -#endif - ret ^= stk; - return ret; -} |